Answer:
It is good for scientists to compare samples because then they can find the differences of the two and do more experiments
Answer:
Helps link different cases
Explanation:
There are many chemicals that can be used to start a fire in an arson case. Many chemicals are known as accelerants, a specific kind of chemical known for starting fires quickly.
In arson cases, the substrate is referred to as the chemical that starts the fire. If a substrate is used in multiple cases, scientists can then let the police know that the incidences may be linked.
